1.

If x(n) is a real sequence, then what is the value of XI(ω)?

A. \(\sum_{n=-∞}^∞ x(n)sin⁡(ωn)\)
B. –\(\sum_{n=-∞}^∞ x(n)sin⁡(ωn)\)
C. \(\sum_{n=-∞}^∞ x(n)cos⁡(ωn)\)
D. –\(\sum_{n=-∞}^∞ x(n)cos⁡(ωn)\)
Answer» C. \(\sum_{n=-∞}^∞ x(n)cos⁡(ωn)\)


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